Class: ActionController::Parameters

Inherits:
Object
  • Object
show all
Defined in:
lib/action_controller/metal/strong_parameters.rb

Overview

Action Controller Parameters

Allows you to choose which attributes should be whitelisted for mass updating and thus prevent accidentally exposing that which shouldn’t be exposed. Provides two methods for this purpose: #require and #permit. The former is used to mark parameters as required. The latter is used to set the parameter as permitted and limit which attributes should be allowed for mass updating.

params = ActionController::Parameters.new({
  person: {
    name: "Francesco",
    age:  22,
    role: "admin"
  }
})

permitted = params.require(:person).permit(:name, :age)
permitted            # => <ActionController::Parameters {"name"=>"Francesco", "age"=>22} permitted: true>
permitted.permitted? # => true

Person.first.update!(permitted)
# => #<Person id: 1, name: "Francesco", age: 22, role: "user">

It provides two options that controls the top-level behavior of new instances:

  • permit_all_parameters - If it’s true, all the parameters will be permitted by default. The default is false.

  • action_on_unpermitted_parameters - Allow to control the behavior when parameters that are not explicitly permitted are found. The values can be false to just filter them out, :log to additionally write a message on the logger, or :raise to raise ActionController::UnpermittedParameters exception. The default value is :log in test and development environments, false otherwise.

Examples:

params = ActionController::Parameters.new
params.permitted? # => false

ActionController::Parameters.permit_all_parameters = true

params = ActionController::Parameters.new
params.permitted? # => true

params = ActionController::Parameters.new(a: "123", b: "456")
params.permit(:c)
# => <ActionController::Parameters {} permitted: true>

ActionController::Parameters.action_on_unpermitted_parameters = :raise

params = ActionController::Parameters.new(a: "123", b: "456")
params.permit(:c)
# => ActionController::UnpermittedParameters: found unpermitted keys: a, b

Please note that these options *are not thread-safe*. In a multi-threaded environment they should only be set once at boot-time and never mutated at runtime.

You can fetch values of ActionController::Parameters using either :key or "key".

params = ActionController::Parameters.new(key: "value")
params[:key]  # => "value"
params["key"] # => "value"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parameters = {}) ⇒ Parameters

Returns a new instance of ActionController::Parameters. Also, sets the permitted attribute to the default value of ActionController::Parameters.permit_all_parameters.

class Person < ActiveRecord::Base
end

params = ActionController::Parameters.new(name: "Francesco")
params.permitted?  # => false
Person.new(params) # => ActiveModel::ForbiddenAttributesError

ActionController::Parameters.permit_all_parameters = true

params = ActionController::Parameters.new(name: "Francesco")
params.permitted?  # => true
Person.new(params) # => #<Person id: nil, name: "Francesco">



235
236
237
238
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 235

def initialize(parameters = {})
  @parameters = parameters.with_indifferent_access
  @permitted = self.class.permit_all_parameters
end

Class Method Details

.hook_into_yaml_loading ⇒ Object

:nodoc:



762
763
764
765
766
767
768
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 762

def self.hook_into_yaml_loading # :nodoc:
  # Wire up YAML format compatibility with Rails 4.2 and Psych 2.0.8 and 2.0.9+.
  # Makes the YAML parser call `init_with` when it encounters the keys below
  # instead of trying its own parsing routines.
  YAML.load_tags["!ruby/hash-with-ivars:ActionController::Parameters"] = name
  YAML.load_tags["!ruby/hash:ActionController::Parameters"] = name
end

Instance Method Details

#==(other) ⇒ Object

Returns true if another Parameters object contains the same content and permitted flag.



242
243
244
245
246
247
248
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 242

def ==(other)
  if other.respond_to?(:permitted?)
    permitted? == other.permitted? && parameters == other.parameters
  else
    @parameters == other
  end
end

#[](key) ⇒ Object

Returns a parameter for the given key. If not found, returns nil.

params = ActionController::Parameters.new(person: { name: "Francesco" })
params[:person] # => <ActionController::Parameters {"name"=>"Francesco"} permitted: false>
params[:none]   # => nil



551
552
553
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 551

def [](key)
  convert_hashes_to_parameters(key, @parameters[key])
end

#[]=(key, value) ⇒ Object

Assigns a value to a given key. The given key may still get filtered out when permit is called.



557
558
559
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 557

def []=(key, value)
  @parameters[key] = value
end

#converted_arrays ⇒ Object

Attribute that keeps track of converted arrays, if any, to avoid double looping in the common use case permit + mass-assignment. Defined in a method to instantiate it only if needed.

Testing membership still loops, but it’s going to be faster than our own loop that converts values. Also, we are not going to build a new array object per fetch.



350
351
352
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 350

def converted_arrays
  @converted_arrays ||= Set.new
end

#deep_dup ⇒ Object

Returns duplicate of object including all parameters.



790
791
792
793
794
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 790

def deep_dup
  self.class.new(@parameters.deep_dup).tap do |duplicate|
    duplicate.permitted = @permitted
  end
end

#delete(key, &block) ⇒ Object

Deletes a key-value pair from Parameters and returns the value. If key is not found, returns nil (or, with optional code block, yields key and returns the result). Cf. #extract!, which returns the corresponding ActionController::Parameters object.



683
684
685
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 683

def delete(key, &block)
  convert_value_to_parameters(@parameters.delete(key, &block))
end

#dig(*keys) ⇒ Object

Extracts the nested parameter from the given keys by calling dig at each step. Returns nil if any intermediate step is nil.

params = ActionController::Parameters.new(foo: { bar: { baz: 1 } })
params.dig(:foo, :bar, :baz) # => 1
params.dig(:foo, :zot, :xyz) # => nil

params2 = ActionController::Parameters.new(foo: [10, 11, 12])
params2.dig(:foo, 1) # => 11



596
597
598
599
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 596

def dig(*keys)
  convert_hashes_to_parameters(keys.first, @parameters[keys.first])
  @parameters.dig(*keys)
end

#each_pair(&block) ⇒ Object Also known as: each

Convert all hashes in values into parameters, then yield each pair in the same way as Hash#each_pair.



336
337
338
339
340
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 336

def each_pair(&block)
  @parameters.each_pair do |key, value|
    yield [key, convert_hashes_to_parameters(key, value)]
  end
end

#except(*keys) ⇒ Object

Returns a new ActionController::Parameters instance that filters out the given keys.

params = ActionController::Parameters.new(a: 1, b: 2, c: 3)
params.except(:a, :b) # => <ActionController::Parameters {"c"=>3} permitted: false>
params.except(:d)     # => <ActionController::Parameters {"a"=>1, "b"=>2, "c"=>3} permitted: false>



626
627
628
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 626

def except(*keys)
  new_instance_with_inherited_permitted_status(@parameters.except(*keys))
end

#extract!(*keys) ⇒ Object

Removes and returns the key/value pairs matching the given keys.

params = ActionController::Parameters.new(a: 1, b: 2, c: 3)
params.extract!(:a, :b) # => <ActionController::Parameters {"a"=>1, "b"=>2} permitted: false>
params                  # => <ActionController::Parameters {"c"=>3} permitted: false>



635
636
637
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 635

def extract!(*keys)
  new_instance_with_inherited_permitted_status(@parameters.extract!(*keys))
end

#fetch(key, *args) ⇒ Object

Returns a parameter for the given key. If the key can’t be found, there are several options: With no other arguments, it will raise an ActionController::ParameterMissing error; if a second argument is given, then that is returned (converted to an instance of ActionController::Parameters if possible); if a block is given, then that will be run and its result returned.

params = ActionController::Parameters.new(person: { name: "Francesco" })
params.fetch(:person)               # => <ActionController::Parameters {"name"=>"Francesco"} permitted: false>
params.fetch(:none)                 # => ActionController::ParameterMissing: param is missing or the value is empty: none
params.fetch(:none, {})             # => <ActionController::Parameters {} permitted: false>
params.fetch(:none, "Francesco")    # => "Francesco"
params.fetch(:none) { "Francesco" } # => "Francesco"



574
575
576
577
578
579
580
581
582
583
584
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 574

def fetch(key, *args)
  convert_value_to_parameters(
    @parameters.fetch(key) {
      if block_given?
        yield
      else
        args.fetch(0) { raise ActionController::ParameterMissing.new(key) }
      end
    }
  )
end

#init_with(coder) ⇒ Object

:nodoc:



771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 771

def init_with(coder) # :nodoc:
  case coder.tag
  when "!ruby/hash:ActionController::Parameters"
    # YAML 2.0.8's format where hash instance variables weren't stored.
    @parameters = coder.map.with_indifferent_access
    @permitted  = false
  when "!ruby/hash-with-ivars:ActionController::Parameters"
    # YAML 2.0.9's Hash subclass format where keys and values
    # were stored under an elements hash and `permitted` within an ivars hash.
    @parameters = coder.map["elements"].with_indifferent_access
    @permitted  = coder.map["ivars"][:@permitted]
  when "!ruby/object:ActionController::Parameters"
    # YAML's Object format. Only needed because of the format
    # backwardscompability above, otherwise equivalent to YAML's initialization.
    @parameters, @permitted = coder.map["parameters"], coder.map["permitted"]
  end
end

#inspect ⇒ Object 



758
759
760
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 758

def inspect
  "<#{self.class} #{@parameters} permitted: #{@permitted}>"
end

#keys ⇒ Object

:method: values

:call-seq:

values()

Returns a new array of the values of the parameters.



207
208
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 207

delegate :keys, :key?, :has_key?, :values, :has_value?, :value?, :empty?, :include?,
:as_json, :to_s, to: :@parameters

#merge(other_hash) ⇒ Object

Returns a new ActionController::Parameters with all keys from other_hash merged into current hash.



721
722
723
724
725
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 721

def merge(other_hash)
  new_instance_with_inherited_permitted_status(
    @parameters.merge(other_hash.to_h)
  )
end

#merge!(other_hash) ⇒ Object

Returns current ActionController::Parameters instance with other_hash merged into current hash.



729
730
731
732
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 729

def merge!(other_hash)
  @parameters.merge!(other_hash.to_h)
  self
end

#permit(*filters) ⇒ Object

Returns a new ActionController::Parameters instance that includes only the given filters and sets the permitted attribute for the object to true. This is useful for limiting which attributes should be allowed for mass updating.

params = ActionController::Parameters.new(user: { name: "Francesco", age: 22, role: "admin" })
permitted = params.require(:user).permit(:name, :age)
permitted.permitted?      # => true
permitted.has_key?(:name) # => true
permitted.has_key?(:age)  # => true
permitted.has_key?(:role) # => false

Only permitted scalars pass the filter. For example, given

params.permit(:name)

:name passes if it is a key of params whose associated value is of type String, Symbol, NilClass, Numeric, TrueClass, FalseClass, Date, Time, DateTime, StringIO, IO, ActionDispatch::Http::UploadedFile or Rack::Test::UploadedFile. Otherwise, the key :name is filtered out.

You may declare that the parameter should be an array of permitted scalars by mapping it to an empty array:

params = ActionController::Parameters.new(tags: ["rails", "parameters"])
params.permit(tags: [])

Sometimes it is not possible or convenient to declare the valid keys of a hash parameter or its internal structure. Just map to an empty hash:

params.permit(preferences: {})

Be careful because this opens the door to arbitrary input. In this case, permit ensures values in the returned structure are permitted scalars and filters out anything else.

You can also use permit on nested parameters, like:

params = ActionController::Parameters.new({
  person: {
    name: "Francesco",
    age:  22,
    pets: [{
      name: "Purplish",
      category: "dogs"
    }]
  }
})

permitted = params.permit(person: [ :name, { pets: :name } ])
permitted.permitted?                    # => true
permitted[:person][:name]               # => "Francesco"
permitted[:person][:age]                # => nil
permitted[:person][:pets][0][:name]     # => "Purplish"
permitted[:person][:pets][0][:category] # => nil

Note that if you use permit in a key that points to a hash, it won’t allow all the hash. You also need to specify which attributes inside the hash should be whitelisted.

params = ActionController::Parameters.new({
  person: {
    contact: {
      email: "[email protected]",
      phone: "555-1234"
    }
  }
})

params.require(:person).permit(:contact)
# => <ActionController::Parameters {} permitted: true>

params.require(:person).permit(contact: :phone)
# => <ActionController::Parameters {"contact"=><ActionController::Parameters {"phone"=>"555-1234"} permitted: true>} permitted: true>

params.require(:person).permit(contact: [ :email, :phone ])
# => <ActionController::Parameters {"contact"=><ActionController::Parameters {"email"=>"[email protected]", "phone"=>"555-1234"} permitted: true>} permitted: true>



528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 528

def permit(*filters)
  params = self.class.new

  filters.flatten.each do |filter|
    case filter
    when Symbol, String
      permitted_scalar_filter(params, filter)
    when Hash
      hash_filter(params, filter)
    end
  end

  unpermitted_parameters!(params) if self.class.action_on_unpermitted_parameters

  params.permit!
end

#permit! ⇒ Object

Sets the permitted attribute to true. This can be used to pass mass assignment. Returns self.

class Person < ActiveRecord::Base
end

params = ActionController::Parameters.new(name: "Francesco")
params.permitted?  # => false
Person.new(params) # => ActiveModel::ForbiddenAttributesError
params.permit!
params.permitted?  # => true
Person.new(params) # => #<Person id: nil, name: "Francesco">



376
377
378
379
380
381
382
383
384
385
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 376

def permit!
  each_pair do |key, value|
    Array.wrap(value).flatten.each do |v|
      v.permit! if v.respond_to? :permit!
    end
  end

  @permitted = true
  self
end

#permitted? ⇒ Boolean

Returns true if the parameter is permitted, false otherwise.

params = ActionController::Parameters.new
params.permitted? # => false
params.permit!
params.permitted? # => true

Returns:

  • (Boolean) 


360
361
362
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 360

def permitted?
  @permitted
end

#reject(&block) ⇒ Object

Returns a new instance of ActionController::Parameters with items that the block evaluates to true removed.



702
703
704
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 702

def reject(&block)
  new_instance_with_inherited_permitted_status(@parameters.reject(&block))
end

#reject!(&block) ⇒ Object Also known as: delete_if

Removes items that the block evaluates to true and returns self.



707
708
709
710
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 707

def reject!(&block)
  @parameters.reject!(&block)
  self
end

#require(key) ⇒ Object Also known as: required

This method accepts both a single key and an array of keys.

When passed a single key, if it exists and its associated value is either present or the singleton false, returns said value:

ActionController::Parameters.new(person: { name: "Francesco" }).require(:person)
# => <ActionController::Parameters {"name"=>"Francesco"} permitted: false>

Otherwise raises ActionController::ParameterMissing:

ActionController::Parameters.new.require(:person)
# ActionController::ParameterMissing: param is missing or the value is empty: person

ActionController::Parameters.new(person: nil).require(:person)
# ActionController::ParameterMissing: param is missing or the value is empty: person

ActionController::Parameters.new(person: "\t").require(:person)
# ActionController::ParameterMissing: param is missing or the value is empty: person

ActionController::Parameters.new(person: {}).require(:person)
# ActionController::ParameterMissing: param is missing or the value is empty: person

When given an array of keys, the method tries to require each one of them in order. If it succeeds, an array with the respective return values is returned:

params = ActionController::Parameters.new(user: { ... }, profile: { ... })
user_params, profile_params = params.require([:user, :profile])

Otherwise, the method re-raises the first exception found:

params = ActionController::Parameters.new(user: {}, profile: {})
user_params, profile_params = params.require([:user, :profile])
# ActionController::ParameterMissing: param is missing or the value is empty: user

Technically this method can be used to fetch terminal values:

# CAREFUL
params = ActionController::Parameters.new(person: { name: "Finn" })
name = params.require(:person).require(:name) # CAREFUL

but take into account that at some point those ones have to be permitted:

def person_params
  params.require(:person).permit(:name).tap do |person_params|
    person_params.require(:name) # SAFER
  end
end

for example.



437
438
439
440
441
442
443
444
445
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 437

def require(key)
  return key.map { |k| require(k) } if key.is_a?(Array)
  value = self[key]
  if value.present? || value == false
    value
  else
    raise ParameterMissing.new(key)
  end
end

#reverse_merge(other_hash) ⇒ Object Also known as: with_defaults

Returns a new ActionController::Parameters with all keys from current hash merged into other_hash.



736
737
738
739
740
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 736

def reverse_merge(other_hash)
  new_instance_with_inherited_permitted_status(
    other_hash.to_h.merge(@parameters)
  )
end

#reverse_merge!(other_hash) ⇒ Object Also known as: with_defaults!

Returns current ActionController::Parameters instance with current hash merged into other_hash.



745
746
747
748
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 745

def reverse_merge!(other_hash)
  @parameters.merge!(other_hash.to_h) { |key, left, right| left }
  self
end

#select(&block) ⇒ Object

Returns a new instance of ActionController::Parameters with only items that the block evaluates to true.



689
690
691
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 689

def select(&block)
  new_instance_with_inherited_permitted_status(@parameters.select(&block))
end

#select!(&block) ⇒ Object Also known as: keep_if

Equivalent to Hash#keep_if, but returns nil if no changes were made.



694
695
696
697
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 694

def select!(&block)
  @parameters.select!(&block)
  self
end

#slice(*keys) ⇒ Object

Returns a new ActionController::Parameters instance that includes only the given keys. If the given keys don’t exist, returns an empty hash.

params = ActionController::Parameters.new(a: 1, b: 2, c: 3)
params.slice(:a, :b) # => <ActionController::Parameters {"a"=>1, "b"=>2} permitted: false>
params.slice(:d)     # => <ActionController::Parameters {} permitted: false>



609
610
611
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 609

def slice(*keys)
  new_instance_with_inherited_permitted_status(@parameters.slice(*keys))
end

#slice!(*keys) ⇒ Object

Returns current ActionController::Parameters instance which contains only the given keys.



615
616
617
618
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 615

def slice!(*keys)
  @parameters.slice!(*keys)
  self
end

#stringify_keys ⇒ Object

This is required by ActiveModel attribute assignment, so that user can pass Parameters to a mass assignment methods in a model. It should not matter as we are using HashWithIndifferentAccess internally.



754
755
756
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 754

def stringify_keys # :nodoc:
  dup
end

#to_h ⇒ Object

Returns a safe ActiveSupport::HashWithIndifferentAccess representation of the parameters with all unpermitted keys removed.

params = ActionController::Parameters.new({
  name: "Senjougahara Hitagi",
  oddity: "Heavy stone crab"
})
params.to_h
# => ActionController::UnfilteredParameters: unable to convert unpermitted parameters to hash

safe_params = params.permit(:name)
safe_params.to_h # => {"name"=>"Senjougahara Hitagi"}



262
263
264
265
266
267
268
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 262

def to_h
  if permitted?
    convert_parameters_to_hashes(@parameters, :to_h)
  else
    raise UnfilteredParameters
  end
end

#to_hash ⇒ Object

Returns a safe Hash representation of the parameters with all unpermitted keys removed.

params = ActionController::Parameters.new({
  name: "Senjougahara Hitagi",
  oddity: "Heavy stone crab"
})
params.to_hash
# => ActionController::UnfilteredParameters: unable to convert unpermitted parameters to hash

safe_params = params.permit(:name)
safe_params.to_hash # => {"name"=>"Senjougahara Hitagi"}



282
283
284
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 282

def to_hash
  to_h.to_hash
end

#to_query(*args) ⇒ Object Also known as: to_param

Returns a string representation of the receiver suitable for use as a URL query string:

params = ActionController::Parameters.new({
  name: "David",
  nationality: "Danish"
})
params.to_query
# => ActionController::UnfilteredParameters: unable to convert unpermitted parameters to hash

safe_params = params.permit(:name, :nationality)
safe_params.to_query
# => "name=David&nationality=Danish"

An optional namespace can be passed to enclose key names:

params = ActionController::Parameters.new({
  name: "David",
  nationality: "Danish"
})
safe_params = params.permit(:name, :nationality)
safe_params.to_query("user")
# => "user%5Bname%5D=David&user%5Bnationality%5D=Danish"

The string pairs “key=value” that conform the query string are sorted lexicographically in ascending order.

This method is also aliased as to_param.



314
315
316
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 314

def to_query(*args)
  to_h.to_query(*args)
end

#to_unsafe_h ⇒ Object Also known as: to_unsafe_hash

Returns an unsafe, unfiltered ActiveSupport::HashWithIndifferentAccess representation of the parameters.

params = ActionController::Parameters.new({
  name: "Senjougahara Hitagi",
  oddity: "Heavy stone crab"
})
params.to_unsafe_h
# => {"name"=>"Senjougahara Hitagi", "oddity" => "Heavy stone crab"}



329
330
331
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 329

def to_unsafe_h
  convert_parameters_to_hashes(@parameters, :to_unsafe_h)
end

#transform_keys(&block) ⇒ Object

Returns a new ActionController::Parameters instance with the results of running block once for every key. The values are unchanged.



662
663
664
665
666
667
668
669
670
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 662

def transform_keys(&block)
  if block
    new_instance_with_inherited_permitted_status(
      @parameters.transform_keys(&block)
    )
  else
    @parameters.transform_keys
  end
end

#transform_keys!(&block) ⇒ Object

Performs keys transformation and returns the altered ActionController::Parameters instance.



674
675
676
677
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 674

def transform_keys!(&block)
  @parameters.transform_keys!(&block)
  self
end

#transform_values ⇒ Object

Returns a new ActionController::Parameters with the results of running block once for every value. The keys are unchanged.

params = ActionController::Parameters.new(a: 1, b: 2, c: 3)
params.transform_values { |x| x * 2 }
# => <ActionController::Parameters {"a"=>2, "b"=>4, "c"=>6} permitted: false>



645
646
647
648
649
650
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 645

def transform_values
  return to_enum(:transform_values) unless block_given?
  new_instance_with_inherited_permitted_status(
    @parameters.transform_values { |v| yield convert_value_to_parameters(v) }
  )
end

#transform_values! ⇒ Object

Performs values transformation and returns the altered ActionController::Parameters instance.



654
655
656
657
658
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 654

def transform_values!
  return to_enum(:transform_values!) unless block_given?
  @parameters.transform_values! { |v| yield convert_value_to_parameters(v) }
  self
end

#values_at(*keys) ⇒ Object

Returns values that were assigned to the given keys. Note that all the Hash objects will be converted to ActionController::Parameters.



715
716
717
 
# File 'lib/action_controller/metal/strong_parameters.rb', line 715

def values_at(*keys)
  convert_value_to_parameters(@parameters.values_at(*keys))
end